Melanie Gibb, the former best friend of Lori Vallow, took the stand on Thursday to testify at Chad Daybell's triple murder trial in Idaho. Daybell, the husband of the so-called "Doomsday Mom," is charged with killing Vallow's two children and his former wife. Last year, Vallow received a life sentence without parole for the killings. Subscribe to FOX 10 Phoenix! https://www.youtube.com/channel/UCNjfNLnQYbjBEvnS8KFuyGQ?sub_confirmation=1 #fox10phoenix #daybell #vallow #trial #doomsday #crime #lorivallow FOX 10 Phoenix delivers breaking news, live events, politics, entertainment, business news and local stories from Phoenix, Arizona and across the nation. Watch more FOX 10 Phoenix on YouTube: Arizona headlines: https://youtube.com/playlist?list=PLjk-Nxa5HqPtshEuaekDdk3dtuBkjdJbJ National headlines: https://www.youtube.com/playlist?list=PLjk-Nxa5HqPtq-kkrH0cQ3ZIYpLj5MGVT Raw footage: https://www.youtube.com/playlist?list=PLjk-Nxa5HqPt6sLbUHtU-fjr-RTh8O_ct